JPH05290563A - Hermetic structure - Google Patents

Abstract

PURPOSE:To enable easy and exact mounting of a packing and to impart good hermeticity by constituting the hermetic structure in such a manner that the packing is pressed by the walls on both sides of the groove of a cover and its central part is deflected when the fitting part of the packing is press fitted into the groove. CONSTITUTION:The packing 35 is pressed to the walls on both sides of the packing detaining part 33 of the groove 32 of the cover 31 when the fitting part 36 of the packing 35 is press fitted into the groove 32. The first and second contact parts 37, 38 are then deflected to the central part and a bending stress acts on the packing 35 to decrease the resistance at the time of insertion of the packing 35. The packing 35 is thus smoothly inserted into the groove 32 until the base end of the packing comes into contact with the bottom of the groove 32. The detachment of the packing 35 from the groove 32 is prohibited by the friction force of the wall surface of the detaining part 33 of the groove 32 generated by the reaction generated by the bending stress and the fitting part 36 of the packing 35. The base end of the packing 35 is so formed as to be gradually narrower as the sectional area is nearer the base end and a space K is therefore formed between the groove 32 and the wall surface at the base end.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a housing whose one surface is open, a lid for covering the open surface of the housing, and one of the housing and the contact surface of the lid. The present invention relates to a hermetically sealed structure including a groove formed over the entire circumference and a packing attached to the groove and capable of contacting the other contact surface.

[0002]

2. Description of the Related Art For example, in a magnetic disk device,
If dust is present in the apparatus, the dust will enter between the magnetic head and the disk that is the recording medium, causing a read error or, in the extreme case, a head crush. Therefore, the magnetic disk device is assembled in a clean environment of Class 100 or less, and the device also has a sealed structure (Disk-Enclosure: hereinafter referred to as DE).

In this DE, a rubber packing is usually used at the joint between the parts that come into contact with the outside air in order to form a closed structure. FIG. 7 is a sectional configuration diagram of a conventional magnetic disk, FIG. 8 is an enlarged view of a portion A of the cover in FIG. 7, and FIG. 9 is an enlarged sectional view of the packing in FIG.

In FIG. 7, reference numeral 1 is a base as a housing whose one surface is open, and 2 is a cover as a lid for covering the open surface of the base 1. And these base 1 and cover 2
It has a DE structure.

In the base 1, a plurality of discs 3 (7 in the example of the prior art) are stacked by means of spacers 4 which are rotatably driven by a spindle motor (not shown). Reference numeral 5 is an actuator that has a head arm 6 extending in the recording surface direction of each disk 3 and is rotationally driven with respect to the base 1 in a direction traversing the track of the disk 3. A head 8 for reading / writing data from / to the disk 3 via a spring arm 7 is provided at the rotating end of the head arm 6.

A magnetic circuit 9 is composed of a yoke 10 and a magnet 11, and is provided on the base 1. On the other hand, the actuator 5 is provided with a coil 12 arranged in the magnetic gap of the magnetic circuit 9, and the magnetic circuit 9 and the coil 12 form a moving coil type force motor.

Next, the sealed structure of this conventional example will be described with reference to FIGS. 8 and 9. A groove 2a is formed over the entire circumference on either one of the contact surfaces of the base 1 and the cover 2 (the contact surface on the cover 2 side in this conventional example), and the other contact surface ( In this conventional example, an elastic packing 13 that can contact the contact surface on the base 1 side is attached. Then, the cover 2 is attached to the base 1 with a screw (not shown), and the packing 13 is pressed against the base 1 to seal the DE. Further, the vicinity of the opening of the groove 2a is a wrap-around portion 2b having an opening area larger than that of other portions.

Further, the width Ap of the packing 13 is set larger than the width Am of the groove 2a, and when the packing 13 is attached to the groove 2a,
The packing 13 is compressed in the width direction and attached to the groove 2a. This is to prevent the packing 13 from falling off from the cover 2. Further, the tip of the packing 13 is formed so that the cross-sectional area becomes gradually narrower toward the tip. This is the packing 13 compressed when sealed.
This is because the tip portion of is deformed in the width direction and wraps around the wraparound portion 2b of the groove 2 to completely bring the cover 2 and the base 1 into close contact with each other.

Next, the operation of the above configuration will be described. The disk 3 is rotationally driven at high speed (for example, 3600 rpm) by a spindle motor (not shown). And coil 1
When a current is applied to the magnetic circuit 2, a driving force is generated in the coil 12 arranged in the magnetic gap of the magnetic circuit 9, the actuator 5 swings with respect to the base 1, and the head 8 moves the recording surface of the disk 3. Move across all tracks and onto the desired track. Then, data reading / writing is performed on the disk 3.

[0010]

However, in the hermetically sealed structure having the above structure, when the elastic packing 13 is attached to the groove 2a of the cover 2, the packing 13 must be compressed in the width direction. However, since the repulsive force of the packing 13 is large and the friction resistance when the packing 13 is fitted is large, it is often twisted and obliquely attached as shown in FIG.

When the cover 2 is attached to the base 1 in such a state, as shown in FIG. 11, the tip of the packing 13 is pinched by the contact surface between the base 1 and the cover 2 and is caught. In such a state, the base 1 and the cover 2 cannot be electrically connected, and in the case of the disk device as described above,
It becomes easy to pick up noise, which causes a read error.

Further, in order to obtain a good sealing property, it is necessary to set the crushing margin of the packing 13 sufficiently, and a gap (a wraparound portion 2b) into which the crushed portion turns is formed in the groove 2. , The packing 13 cannot be completely crushed and there is still a gap.

In order to prevent the above-mentioned twisting of the packing 13, it is sufficient to make the cross-sectional shape of the packing 13 a simple o shape, but since it is compressed in the width direction, the diameter becomes large and the crushing margin is large. There is a problem that it becomes too tight to obtain a perfect seal.

The present invention has been made in view of the above problems, and an object thereof is to provide a hermetically sealed structure in which the packing can be easily mounted, can be accurately mounted, and has a good hermeticity.

[0015]

FIG. 1 is a principle view of the invention described in claim 1. In the figure, reference numeral 21 is a housing whose one surface is open, and 22 is a lid which covers the open surface of the housing 21. 23
Is a groove formed over the entire circumference on the contact surface 22a of either one of the contact surfaces 21a and 22a of the housing 21 and the lid 22 (on the side of the lid 22 in the principle view). Reference numeral 24 is an elastic packing that is attached to the groove 23 and can abut against the other abutting surface 21a.

The packing 24 has a fitting portion 24a formed on the base end side, a first contact portion 24b formed on the tip end side and abutting the other contact surface, and a tip end side. A second abutting portion 24c that is abutted against the other abutting surface,
Between the first abutting portion 24b and the second abutting portion 24c, there is formed a recessed portion 24d formed to the inside of the fitting portion 24a.

Further, the fitting portion 24a of the packing 24 of the groove 23
The width of the portion that comes into contact with is smaller than the width of the fitting portion 24a of the packing. Next, the invention according to claim 2 is
The groove 23 in claim 1 is composed of a packing engaging portion into which the packing 24 fits, and a wrap-around portion having an opening area larger than that of the packing engaging portion.

Next, the invention according to claim 3 is such that the fitting portion of the packing 24 according to claim 1 or 2 is formed so that the cross-sectional area becomes gradually narrower toward the base end side. ..

Next, the invention according to claim 4 is such that the packing engaging portion of the groove 23 in claim 1 or 2 is formed so that the cross-sectional area gradually becomes wider toward the bottom. Finally, the invention according to claim 5 is one of a housing of the magnetic disk device whose one surface is open, a lid covering the open surface of the housing, and the housing and the contact surface of the lid. In a hermetically sealed structure including a groove formed on the contact surface over the entire circumference and a packing made of an elastic material that is attached to the groove and can contact the other contact surface, the packing has a base end side. The formed fitting portion, a first contact portion formed on the tip end side and abutting on the other contact surface, and a second contact portion formed on the tip end side and abutting the other contact surface. A portion of the groove that abuts on the fitting portion of the packing, the contact portion and a recess formed between the first abutting portion and the second abutting portion to the inside of the fitting portion. The width is set to be narrower than the width of the fitting portion of the packing.

[0020]

In the hermetically sealed structure according to the first and fifth aspects of the present invention, when the packing 24 is attached to the groove 23 of the lid 22, when the fitting portion 24a is pressed into the groove 23, the packing 24 is
Is pushed by the walls on both sides of the groove 23, and the first contact portion 24b,
The second contact portion 24c bends in the central portion, bending stress acts on the packing 24, the resistance at the time of fitting the packing 24 is small, and smooth mounting can be performed.

The friction force between the wall surface of the groove 23 and the packing 24, which is generated by the reaction force due to the bending stress, prevents the packing 24 from being separated from the groove 23. Further, at the time of sealing, the first contact portion 24b and the second contact portion 24c are compressed and wrap around into the recess 24d.

In the hermetically sealed structure according to the second aspect of the invention, the compressed packing wraps around the wraparound portion of the groove,
The adhesion is perfect. In the contact structure according to the third aspect of the invention, a space is formed between the tip of the packing and the groove. When the packing is in close contact, it receives a compressive force in the height direction, but the tip of the packing wraps around in the space and completes the close contact.

In the contact structure according to the fourth aspect of the present invention, a space is formed between the tip of the packing and the groove. When the packing is in close contact, it receives a compressive force in the height direction, but the tip of the packing wraps around in the space and completes the close contact.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings when applied to the magnetic disk device described in the prior art. FIG. 2 is a sectional configuration diagram illustrating an embodiment of the present invention,
3 is a cross-sectional configuration diagram of the lid in FIG. 2, FIG. 4 is a cross-sectional view taken along the line AA in FIG. 6, which is an external view of the packing, FIG. 5 is a cross-sectional view when the packing is attached to the groove of the cover, and FIG. FIG.

In this embodiment, the internal structure of the magnetic disk is the same as that of the conventional example, and the description thereof is omitted.
First, the groove 32 provided over the entire circumference on the contact surface 31a with the base of the cover 31 as a lid will be described with reference to FIG. The groove 32 is a packing engaging portion 3 with which the packing fits.
3 and a wrap-around portion 34 having an opening area larger than that of the packing engagement portion 33.

Next, referring to FIGS. 4 and 6, the packing 3
5 will be described. The packing 35 has a shape as shown in FIG. 6, and the shape is determined according to the shape of the groove 32.

This packing 35, as shown in FIG.
The fitting portion 36 formed on the base end side, the first contact portion 37 formed on the tip end side for contacting the contact surface of the base, and the contact surface formed on the tip end side for the base. The second contact portion 38 is in contact with the first contact portion 37 and the second contact portion 38, and a recess 39 is formed between the first contact portion 37 and the second contact portion 38 to the inside of the fitting portion 36. Further, the fitting portion 36 of the packing 35 is formed so that the cross-sectional area becomes gradually narrower toward the base end portion. In this embodiment, the packing 35 has a rubber strength of 50.
A certain amount of fluorine rubber was used.

Then, as shown in FIGS. 3 and 4, the groove 3
The width Bm of the second packing engaging portion 33 and the width Bp of the fitting portion 36 of the packing 35 in the natural state are set so that Bp is slightly larger than Bm.

Next, the packing 35 is attached to the groove 32 of the cover 31.
The description when attached to will be described with reference to FIG. First, when the fitting portion 36 of the packing 35 is press-fitted into the groove 32 of the cover 31, the packing 35 is pushed by the walls on both sides of the packing engaging portion 33 of the groove 32, and the first contact portion 37 and the second contact portion 37. Abutting part 38
Bends toward the center, and bending stress acts on the packing 35,
Resistance when the packing 35 is fitted is small, and smooth insertion can be performed until the base end of the packing 35 comes into contact with the bottom of the groove 32.

The friction force between the wall surface of the packing engaging portion 33 of the groove 32 and the fitting portion 36 of the packing 35, which is generated by the reaction force due to the bending stress, prohibits the packing 35 from being separated from the groove 32. At this time, since the base end portion of the packing 35 is formed so that the cross-sectional area thereof becomes gradually narrower toward the base end portion, a space K is formed between the base end portion and the wall surface of the groove 32. There is.

Next, the case where the cover 31 with the packing 35 set is attached to the base 40 as a housing is shown in FIG.
Will be explained. Cover 4 in the state shown in FIG.
When pressed to 0, the first and second contact portions 37, 38 of the packing 35 press against the contact surface 40a of the base 40, the packing 35 is compressed in the height direction, and a first crushing margin is provided.
The contact portion 37 and the second contact portion 38 of wrap around the recess 39.

In this embodiment, the fitting portion 36 of the packing 35 receives a compressive force, deforms in the width direction, and wraps around in the space K. Further, in this embodiment, since the wrap-around portion 34 is formed in the groove 32, the first and second contact portions 37, 38 are formed.
Even if the groove cannot enter the recess 39, a space is formed in the groove 32 in the groove 32.
Also, the second contact portions 37, 38 can go around.

According to the above construction, the packing 35 is provided in the groove 32.
When it is attached to, it can be correctly inserted into the soums and is not attached diagonally as in the conventional example. Then, by properly installing the packing 35,
The packing 35 does not get caught between the cover 31 and the base 40.

The first and second abutting portions 37, 38 serving as a crushing margin of the packing 35 are provided with a recess 39 and a wrap-around portion 3.
Since it can wrap around 4, it can be completely crushed even with a sufficient crushing margin, and perfect adhesion can be obtained.

The present invention is not limited to the above embodiment. In the above embodiment, the wraparound portion 34 is provided in the groove 32, but it is not always necessary. Further, the fitting portion 36 of the packing 35 is formed so that the cross-sectional area becomes narrower toward the base end portion, but it is not always necessary to form in this way.
On the contrary, with a constant cross-sectional area, the packing engagement portion 33 of the groove 32 is formed so that the cross-sectional area gradually increases toward the bottom.
The space K may be formed. Furthermore, the space K is not always necessary.

In the above embodiment, the groove 3 is formed on the cover 31.
2 is provided, conversely, a groove may be provided in the base 40 and a packing may be attached.

[0037]

As described above, according to the present invention, it is possible to realize a hermetically sealed structure in which the packing can be easily mounted, can be accurately mounted, and has a good hermeticity.

[Brief description of drawings]

FIG. 1 is a principle diagram of the invention according to claim 1;

FIG. 2 is a sectional configuration diagram illustrating an embodiment of the present invention.

FIG. 3 is a cross-sectional configuration diagram of the lid in FIG.

4 is a cross-sectional view taken along the line AA in FIG. 6, which is an external view of the packing.

FIG. 5 is a sectional view when a packing is attached to a groove of the cover.

FIG. 6 is an external view of a packing.

FIG. 7 is a cross-sectional configuration diagram of a conventional magnetic disk.

FIG. 8 is an enlarged view of a portion A of the cover shown in FIG.

9 is an enlarged cross-sectional view of the packing in FIG.

FIG. 10 is a diagram illustrating a problem.

FIG. 11 is a diagram illustrating a problem.

[Explanation of symbols]

 21, 40 Housing (base) 21a, 22a, 31a, 40a Contact surface 22, 31 Lid (cover) 23, 32 Groove 24, 35 Packing 24a, 36 Fitting part 24b, 37 First contact part 24c, 38 2nd contact part 24d, 39 hollow part

Claims (5)

[Claims] 1. A housing (21) having an open surface, a lid (22) covering the open surface of the housing (21), and the housing (2).
1), a groove (2) formed over the entire circumference on one of the contact surfaces (21a, 22a) of the lid (22)
3) and an elastic packing (24) attached to the groove (23) and capable of contacting the other contact surface, the packing (24) is formed on the base end side. And a first contact portion (24b) formed on the tip end side and abutting the other contact surface, and a first contact portion (24b) formed on the tip end side and abutting the other contact surface. A second abutting portion (24c) in contact with the first abutting portion (24b) and the second abutting portion (24)
c) and a recess (24d) formed to the inside of the fitting portion (24a), the fitting portion (24) of the packing (24) of the groove (23).
The sealed structure is characterized in that a portion abutting a) is set to have a width narrower than a width of the fitting portion (24a) of the packing (24). 2. The groove is composed of a packing engaging portion into which the packing fits, and a wrap-around portion having an opening area larger than that of the packing engaging portion. The sealed structure according to 1. 3. The hermetically sealed structure according to claim 1, wherein the fitting portion of the packing is formed so that its cross-sectional area becomes gradually narrower toward the base end side. 4. The hermetically sealed structure according to claim 1, wherein the packing engaging portion of the groove is formed so that the cross-sectional area thereof gradually increases toward the bottom. 5. A housing of a magnetic disk device having an open surface, a lid for covering the open surface of the housing, and an entire contact surface of one of the housing and the contact surface of the lid. In a sealed structure comprising a groove formed over the circumference and an elastic packing attached to the groove and capable of abutting on the other abutting surface, the packing is a fitting portion formed on the base end side. A first contact portion formed on the tip end side and abutting on the other contact surface; a second contact portion formed on the tip end side and abutting on the other contact surface; The first contact portion and the second contact portion have a recess formed to the inside of the fitting portion, and the portion of the groove that abuts the fitting portion of the packing is the fitting of the packing. The sealed structure is characterized in that the width is set narrower than the width of the part.